This is mostly a bug-fix release, probably a first 'stable' 0.8 version without major bugs
Source and binary packages for Windows and Linux are available for download. You can also get FlameRobin for MacOSX . Also you can read the full release notes.
For ubuntu read this page http://flamerobin.blogspot.com/2008/03/flamerobin-086-package-for-ubuntu.html, in Debian is included in testing/unstable version